Hi Erika, yes I read that one. Thanks. I'm just trying to figure out why the replacement hip would tend to dislocate more easily. I thought they were a very close replica of the original hip joint. And with the anterior method of THR, there is apparently minimal disturbance to the surrounding muscle, tendons, and ligaments. So I'm curious what it is about the structure of the replacement joint that makes it more susceptible to dislocation.